Planning the electrical installation 83
WARNING! When the Vector control mode is in use, never open the output
contactor while the drive controls the motor. The vector control operate
extremely fast, much faster than it takes for the contactor to open its contacts. When
the contactor starts opening while the drive controls the motor, the vector control will
try to maintain the load current by immediately increasing the drive output voltage to
the maximum. This will damage or destroy the contactor completely.
Implementing a bypass connection
If frequent bypassing is required, employ mechanically or electrically interlocked
contactors between the motor and the drive and between the motor and the power
line. Make sure with interlocking that the contactors cannot be closed simultaneously.
The installation must be clearly marked as defined in IEC/EN 61800-5-1, subclause
6.5.3, for example, “THIS MACHINE STARTS AUTOMATICALLY”.
Note: The bypass connection cannot be used with permanent magnet motors or
synchronous reluctance motors.
WARNING! Never connect the drive output to the electrical power network.
The connection may damage the drive.
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